10 research outputs found

    A Measurement of the Partial Width of the Z0^0 Boson into b Quark Pairs

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    Charged particle multiplicity distributions in Z0 hadronic decays

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    This paper presents an analysis of the multiplicity distributions of charged particles produced in Z0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is <nch>=20.71±0.04(stat)±0.77(syst) and the dispersion D=6.28±0.03(stat)±0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge. © 1991 Springer-Verlag

    Energy-energy Correlations in Hadronic Final States from the Z0^0 Decays

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    Energy-energy correlations in hadronic final states from Z0 decays

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    We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ(5)/MS = 104-20 +25 (stat.)-20 +25(syst.)-00 +30(theor.) MeV, which corresponds to αs(91 GeV) = 0.106± 0.003 (stat.)±0.003(syst.)-0.000 +0.003(theor.). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    The DELPHI detector at LEP

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    DELPHI is a 4π detector with emphasis on particle identification, three-dimensional information, high granularity and precise vertex determination. The design criteria, the construction of the detector and the performance during the first year of operation at the large electron positron collider (LEP) at CERN are described. © 1991 - Elsevier Science Publishers B.V. (North-Holland)

    The DELPHI detector at LEP

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    ALICE Technical Design Report on Forward Detectors : FMD, T0 and V0

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    ALICE PHASE EI SEP ACC S2

    ALICE Technical Design Report of the Computing

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    ALICE, EI PHASE SE
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